From amusing and pointless to downright dangerous lanes, the book catalogues 50 of the worst examples of cycle facilities in Britain, some of which we've featured in our gallery today. You know the sort: lanes with bollards in the middle of them, ones that last two metres, the type that end abruptly and spit you out into the middle of fast-flowing traffic.

The Guardian's cycle commuters and bike bloggers know from experience there are many more out there, both in the UK and around the world, so we would like you to share them on our World's worst cycle lanes Flickr group. A selection will appear here on environmentguardian.co.uk, and possibly in the print version of the Guardian too.

You never know, your picture might just shame your local authority into taking action and make its lanes fit for purpose.